JP2020157191A - Air bubble separation/removal device - Google Patents

Abstract

To provide an air bubble separation/removal device improved so as to be able to separate and remove only gas constituting air bubble included in fluid.SOLUTION: The air bubble separation/removal device is equipped with: an air bubble removal device 120 that separates liquid from which air bubble should be removed flowing in through an inflow port P1 into first liquid having air bubble removed and second liquid containing the air bubble, by utilizing swirl flow of the liquid from which the air bubble should be removed, makes the first liquid flow out through a first outflow port P1 and makes the second liquid flow out through a second outflow port P2; a sub tank 130, into which the second liquid flown out through the second outflow port P2 flows, which has a float valve 142 at an upper part thereof; a downstream adjustment valve 143 arranged at first air bubble removal fluid outflow piping 145 connected to the first outflow port P1; and a return adjustment valve 144 arranged in a second air bubble removal fluid outflow piping 146 whose one end is connected to a bottom part of the sub tank 130 and whose other end is connected to a downstream side of the downstream adjustment valve 143 of the first air bubble removal fluid outflow piping 145.SELECTED DRAWING: Figure 1

Description

The present invention relates to a bubble separation / removal device that separates and removes bubbles contained in a liquid by using a rotating flow, and more particularly to an improved bubble separation / removal device that can separate and remove only the gas constituting the bubbles from the liquid. ..

There are demands in various fields for removing air bubbles from a liquid. For example, in the manufacturing process of foods and chemicals, it may not be preferable if bubbles are mixed in the liquid as a raw material. In this case, it is necessary to efficiently separate and remove the bubbles from the liquid as a raw material.

Conventionally, as this kind of bubble separation / removal device, the one disclosed in Patent Document 1 is known.

The "bubble removing device in a liquid" disclosed in Patent Document 1 is composed of a fluid chamber having at least one inflow port at one end and an outflow port at the other end, and the inflow port is a fluid in a liquid. In the bubble removing device that creates a tangential flow with respect to the inner wall of the chamber, the fluid chamber is connected to a first fluid chamber whose diameter gradually and continuously decreases from the inlet to the outlet, and the first fluid chamber. The first fluid chamber and the second fluid are formed from the second fluid chamber whose diameter gradually and continuously increases toward the other end, and from the end surface of the first fluid chamber on the inflow port side. An air outlet that opens up to the vicinity of the joint position with the chamber or a gas air exhaust tube that opens up to the position is provided on the same axis with respect to the axial center of the fluid chamber.

Japanese Unexamined Patent Publication No. 5-84403

By the way, in the "air bubble removing device in liquid" described in Patent Document 1, gas constituting bubbles and some liquid are discharged from the air outlet or the gas air vent tube, but the discharged slightly There is a desire to incorporate this liquid into the bubble removal liquid.

Therefore, an object of the present invention is to provide an improved bubble separation / removal device that can separate and remove only the gas constituting the bubbles contained in the fluid.

In order to achieve the above object, the invention of claim 1 includes a first liquid in which bubbles have been removed and bubbles in the liquid to be removed from bubbles flowing from the inflow port by utilizing a swirling flow of the liquid to be removed. A bubble separation device that separates into two liquids, discharges the first liquid from the first outlet, and discharges the second liquid from the second outlet, and flows out from the second outlet. A sub-tank provided with a float valve at the top, a downstream adjusting valve arranged in a first bubble removing fluid outflow pipe connected to the first outlet, and one end thereof. A return regulating valve connected to the bottom of the sub-tank and the other end of which is arranged in a second bubble removing fluid outflow valve connected to the downstream side of the downstream adjusting valve of the first bubble removing fluid outflow pipe. It is characterized by having.

The invention of claim 2 is the invention of claim 1, wherein the bubble separation device is provided in the sub tank, and the first bubble removing fluid outflow pipe passes through the bottom surface of the sub tank to separate the bubbles. It is characterized in that it is connected to the first outlet of the device.

The invention according to claim 3 is the invention according to claim 1 or 2, wherein the bubble separating device has a swirling flow forming portion for forming a swirling flow of the fluid to be removed from bubbles flowing in from the inflow port, and the swirling flow forming portion. A first fluid chamber whose diameter gradually decreases toward the downstream side of the swirling flow formed by the flow forming portion, and a first fluid chamber provided on the central axis of the first fluid chamber, one end of which is the first fluid chamber. A second fluid chamber provided on the downstream side of the first fluid chamber is provided, and the first outlet is provided in the second fluid chamber to provide the first outlet. The trachea is provided with the second outlet.

The invention of claim 4 is the invention according to claim 1 or 2, wherein the bubble separating device has a swirling flow forming portion for forming a swirling flow of the fluid to be removed from bubbles flowing in from the inflow port, and the swirling flow forming portion. A first fluid chamber whose diameter gradually decreases toward the downstream side of the swirling flow formed by the flow forming portion, and a first fluid chamber provided on the central axis of the first fluid chamber, one end of which is the first fluid chamber. A tapered wall formed on the periphery of the protruding portion of the air vent tube and gradually decreasing in diameter toward the downstream side of the swirling flow, and a first provided on the downstream side of the first fluid chamber. It is characterized in that the second fluid chamber is provided with the first outlet, and the air outlet is provided with the second outlet.

According to the present invention, the bubble removal target liquid flowing in from the inflow port is separated into a first liquid from which bubbles have been removed and a second liquid containing bubbles by utilizing the swirling flow of the bubble removal target liquid. A bubble separator that allows the first liquid to flow out of the first outlet and the second liquid to flow out of the second outlet, and a second liquid that flows out of the second outlet flow in. A sub-tank provided with a float valve at the top, a downstream adjusting valve arranged in the first air bubble removing fluid outflow pipe connected to the first outlet, and one end connected to the bottom of the sub-tank. Since the other end is provided with a return adjusting valve arranged in the second bubble removing fluid outflow pipe connected to the downstream side of the downstream adjusting valve of the first bubble removing fluid outflow pipe, the fluid is provided. It has the effect of being able to separate and remove only the gas that constitutes the bubbles contained therein.

FIG. 1 is a fluid circuit diagram showing an example of a bubble separation / removal system configured by using the bubble separation / removal device according to the present invention. FIG. 2 is a schematic cross-sectional view of an example of the bubble separation / removal device used in the fluid circuit diagram shown in FIG. FIG. 3 is a schematic view showing an example and another example of the bubble separation device shown in FIG.

Hereinafter, embodiments of the bubble separation / removal device according to the present invention will be described in detail with reference to the accompanying drawings.

FIG. 1 is a fluid circuit diagram showing an example of a bubble separation / removal system configured by using the bubble separation / removal device according to the present invention.

In FIG. 1, the main tank 110 contains a liquid to be removed by bubbles, from which bubbles are separated and removed by the bubble separation / removal device 100. The liquid to be removed from bubbles stored in the main tank 110 is pressurized by 141 and flows into the inflow port P0 of the bubble separator 120.

The bubble separation / removal device 100 includes a bubble separation device 120, a sub tank 130, a float valve 142, a downstream adjustment valve 143, and a return adjustment valve 144.

Here, the bubble separation device 120 uses the swirling flow of the bubble removal target liquid as the bubble removal target liquid that has flowed in from the inflow port P0 to form a first liquid from which bubbles have been removed and a second liquid containing bubbles. The first liquid flows out from the first outlet P1 and the second liquid flows out from the second outlet P2. Details of the bubble separator 120 will be described later with reference to FIG.

The second liquid containing the bubbles flowing out from the second outlet P2 of the bubble separator 120 is guided to the sub tank 130. The sub tank 130 is provided with a float valve 142 at the upper part, collects bubbles from a second liquid containing bubbles flowing in from the second outlet P2 of the bubble separator 120, and uses the collected gas as the float valve. It is released to the outside through 142. A baffle plate 131 may be provided inside the sub tank 130 to improve the bubble removing performance.

The first liquid from which the bubbles flowing out from the first outlet P1 of the bubble separator 120 have been removed flows to the first bubble removing fluid outflow pipe 145 connected to the outlet P1 of the first outlet P1. A downstream adjusting valve 143 is provided in the first bubble removing fluid outflow pipe 145.

A second bubble removing fluid outflow pipe 146 through which the liquid separated by the bubbles flows flows is connected to the bottom of the sub tank 130, and a return adjusting valve 144 is provided in the second bubble removing fluid outflow pipe 146. Has been done.

The liquid from which the air bubbles that have passed through the downstream adjustment valve 143 and the liquid from which the air bubbles that have passed through the return adjustment valve 144 have been removed merge with the bubble removal fluid discharge pipe 147 and are discharged.

The operation of the bubble separation / removal device 100 will be described as follows.

1) The bubble separation device 120 flows in the liquid to be removed from bubbles from the inflow port P0, and uses the swirling flow of the liquid to be removed to remove bubbles to remove bubbles from the first liquid and the second liquid containing bubbles. Separate into.

2) The first liquid separated by the bubble separating device 120 is discharged from the bubble removing fluid discharge pipe 147 from the first outlet P1 through the first bubble removing fluid outflow pipe 145 and the downstream adjusting valve 143.

3) The second liquid separated by the bubble separating device 120 is guided from the second outlet P2 to the sub tank 130.

4) Then, the float valve 142 is open until the inside of the sub tank 130 is filled with the liquid in which bubbles are separated, and the gas collected in the sub tank 130 is released to the outside through the float valve 142.

5) After a while, the inside of the sub tank 130 is filled with the liquid from which bubbles are separated, the float of the float valve 142 rises, and the float valve 142 is closed. In this state, the liquid in which the bubbles are separated in the sub tank 130 passes through the second bubble removing fluid outflow pipe 146 and the return adjustment valve 144, and is discharged from the bubble removing fluid discharge pipe 147.

The bubble separation / removal device 100 repeats the operations 4) and 5) above in the operating state, and releases only the gas separated and removed from the liquid to be removed from the bubbles into the atmosphere.

Here, the downstream adjustment valve 143 adjusts the bubble removal condition of the bubble separation / removal device 100, and the return adjustment valve 144 adjusts the liquid level holding pressure in the sub tank 130.

FIG. 2 is a schematic cross-sectional view of an example of the bubble separation / removal device used in the fluid circuit diagram shown in FIG. The bubble separation / removal device 100 shown in FIG. 2 is configured by accommodating the bubble separation device 120 in the sub tank 130. In this configuration, the first bubble removing fluid outflow pipe 145 is connected to the first outlet P1 of the bubble separator 100 through the bottom surface of the sub tank 130. Further, the second outlet P2 of the bubble separation device 100 is provided in the sub tank 130, and the second liquid is directly discharged into the sub tank 130. Other configurations are the same as those of the bubble separation / removal device 100 shown in FIG.

FIG. 3 is a schematic view showing an example (FIG. 3 (A)) and another example (FIG. 3 (B)) of the bubble separator 120 shown in FIGS. 1 and 2.

In FIG. 3, an example of details of the bubble separation device 120 of the bubble separation / removal device 100 according to the present invention is shown in FIG. 3 (A). The bubble separation device 120 shown in FIG. 3A includes a swirl flow forming unit 122 that forms a swirl flow of the bubble removal target liquid from the bubble removal target liquid flowing in from the inflow port P0 shown in FIGS. 1 and 2. It includes a first fluid chamber 123, a second fluid chamber 124 provided on the downstream side of the first fluid chamber 123, and an air discharge pipe 125 having one end open in the first fluid chamber 123. ing.

Here, the swirl flow forming portion 122 includes a ring flow path 121 formed along the outer circumference of the swirl flow forming portion 122, and discharge ports (not shown) provided at two locations connected to the ring flow path 121. It is composed of.

The first fluid chamber 123 is composed of a space surrounded by a truncated cone-shaped inner peripheral wall 123a whose diameter gradually decreases toward the downstream side, and the liquid P0 for bubble removal formed by the swirling flow forming portion 122 is a liquid P0 to be removed. It is flushed into the space surrounded by the inner peripheral wall 123a.

The second fluid chamber 124 has a cylindrical shape, one end of which is connected to the downstream side of the first fluid chamber 123, and the other end of which is a first liquid from which bubbles have been removed by the bubble separation / removal device 100. It forms an outflow outlet P1.

The air exhaust pipe 125 is provided on the central axis of the first fluid chamber 123, one end of which is provided with an opening protruding into the first fluid chamber 123, and the other end of which is the bubble separator 100. It forms an outlet P2 that discharges a second liquid containing separated bubbles.

That is, the liquid to be removed from bubbles flowing from the inflow port P1 flows in the ring flow path 121 of the swirl flow forming portion 122, and is along the tangential direction of the peripheral wall of the discharge port first fluid chamber 123 connected to the ring flow path 121. The liquid P0 to be removed from bubbles is discharged into the first fluid chamber 123, and a swirling flow of the liquid P0 to be removed from bubbles is formed in the first fluid chamber 123.

The swirling flow of the liquid P0 to be removed from bubbles formed in the first fluid chamber 123 is surrounded by a truncated cone-shaped inner peripheral wall 123a whose diameter gradually decreases toward the downstream side of the first fluid chamber 123. It flows in the space.

Here, due to the centrifugal force of the swirling flow of the liquid to be removed from bubbles, the fluid containing no bubbles moves toward the peripheral wall 123a side of the first fluid chamber 123, and the bubbles move to the peripheral wall 123a side of the first fluid chamber 123, and the bubbles are shown by bubbles B in FIG. It is collected around the opening of the air outlet tube 125 in the fluid chamber 123 of 1.

Then, the bubbles B collected around the opening of the air release tube 125 in the first fluid chamber 123 are drawn into the air release tube 125 by the back pressure applied from the second fluid chamber 124 side, and include the bubbles B. The second liquid is discharged from the outlet P2 at the other end of the air discharge pipe 125.

On the other hand, the second liquid from which bubbles have been removed in the first fluid chamber 123 by the air vent pipe 125 passes through the second fluid chamber 124 and flows out from the outlet P1.

FIG. 3B is a schematic diagram showing another example of the bubble separator 120 shown in FIG. 3A. In the bubble separator 120 shown in FIG. 3 (B), a tapered wall 126 is formed on the peripheral edge of the protruding portion of the air release pipe 125 of the bubble separator 120 of FIG. 3 (A), and is formed in the first fluid chamber 123. The swirling flow of the liquid to be removed from bubbles is formed on the truncated cone-shaped inner peripheral wall 123a whose diameter gradually decreases toward the downstream side of the first fluid chamber 123 and the downstream formed on the peripheral edge of the protrusion of the air release pipe 125. It flows in a space surrounded by a tapered wall 126 whose diameter gradually decreases toward the side.

The presence of the tapered wall 126 makes it possible to collect the bubbles B more efficiently around the opening of the air discharge tube 125 as compared with the case of FIG. 3A without the tapered wall 126, so that the bubble removal rate can be increased. It can be increased and the pressure loss can be reduced.

This is because the tapered wall 126 eliminates the wasted space through which the swirling flow of the liquid to be removed from bubbles formed by the swirling flow forming portion 122 flows, so that the turbulent flow of the liquid to be removed from bubbles in the first fluid chamber 123 is significantly increased. It is considered that this is because the amount of decrease in the flow velocity of the liquid to be removed from bubbles is reduced. Other configurations are the same as those of the bubble separator 120 shown in FIG. 3 (A).

The above is an example of a typical embodiment of the present invention, but the present invention is not limited to the above-mentioned Examples and the Examples shown in the drawings, and can be appropriately modified and implemented without changing the gist thereof. Is.

100 Bubble separation and removal device 110 Main tank 120 Bubble separation device 122 Swirling flow forming part 123 First fluid chamber 124 Second fluid chamber 125 Air discharge pipe 126 Tapered wall 130 Sub tank 131 Baffle plate 141 Supply pump 142 Float valve 143 Downstream adjustment valve 144 Return adjustment valve 145 First bubble removal fluid outflow pipe 146 Second bubble removal fluid outflow pipe 147 Bubble removal fluid discharge pipe P0 Inflow port P1 First outflow port P2 Second outflow port

Claims (4)

The liquid to be removed from bubbles that has flowed in from the inflow port is separated into a first liquid from which bubbles have been removed and a second liquid containing bubbles by using the swirling flow of the liquid to be removed from bubbles, and the first liquid is separated. A bubble separator that flows out from the first outlet and discharges the second liquid from the second outlet,
A sub-tank in which the second liquid flowing out from the second outlet flows in and a float valve is provided at the upper part, and
A downstream adjusting valve arranged in the first bubble removing fluid outflow pipe connected to the first outlet, and
A return regulating valve arranged at one end connected to the bottom of the sub-tank and the other end connected to a second bubble removing fluid outflow pipe connected to the downstream side of the downstream adjusting valve of the first bubble removing fluid outflow pipe. ,
A bubble separation / removal device, which comprises. The bubble separating device is provided in the sub tank and is provided in the sub tank.
The bubble separation / removal device according to claim 1, wherein the first bubble removal fluid outflow pipe is connected to the first outlet of the bubble separation device through the bottom surface of the sub tank. The bubble separator
A first swirling flow forming portion that forms a swirling flow of the liquid to be removed from bubbles that has flowed in from the inflow port, and a first that gradually decreases in diameter toward the downstream side of the swirling flow formed by the swirling flow forming portion. With the fluid chamber
An air vent tube provided on the central axis of the first fluid chamber and one end of which opens into the first fluid chamber.
A second fluid chamber provided on the downstream side of the first fluid chamber, and
Equipped with
The bubble separation / removal device according to claim 1 or 2, wherein the first outlet is provided in the second fluid chamber, and the second outlet is provided in the air exhaust pipe. The bubble separator
A first swirling flow forming portion that forms a swirling flow of the liquid to be removed from bubbles that has flowed in from the inflow port, and a first that gradually decreases in diameter toward the downstream side of the swirling flow formed by the swirling flow forming portion. With the fluid chamber
An air vent tube provided on the central axis of the first fluid chamber and one end of which projects into the first fluid chamber.
A tapered wall formed on the periphery of the protruding portion of the air exhaust pipe and whose diameter gradually decreases toward the downstream side of the swirling flow.
A second fluid chamber provided on the downstream side of the first fluid chamber, and
Equipped with
The bubble separation / removal device according to claim 1 or 2, wherein the first outlet is provided in the second fluid chamber, and the second outlet is provided in the air exhaust pipe.

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